Multiple firing blasting apparatus



June 16, 1936. H. w. BURNEY 044,666

MULTIPLE FIRING BLASTING APPARATUS `Filed April 18, 19:52

"fill I :IFSI: 5^ 559i INVENTOR.

,/zovze ATTORNEY.

Patented June 16, 1936 narran STATES PATENT OFFICE 4 Claims.

This invention has for its object to provide an improved multiple firingblasting apparatus, commonly known as a blasting battery.

So far as the inventor is aware there are no blasting batteries now inuse or heretofore patented wherein a multiplicity of explosions may bebrought about without resetting lor readjustlngA the Wires for eachexplosion, and connecting thel wires to the firing battery. That is, theoperator must set the wires from the battery to the point of explosionor blasting place, make the discharge, and then reset the wires foranother explosion or blast.

In keeping with the foregoing it is the object of this invention toprovide a multiple firing blasting battery which can be set and arrangedfor making one or more blasts at a remote and safe point from thebattery, without the necessity of the operator moving from theringcontrolling point. The apparatus also includes means for firing a seriesof charges or blasts of explosive material, either one at a time, or alltogether, and then ring another series oi blasts in the same manner,without any resetting of wires or change of location of the operator.

rThe invention may be readily understood from a perusal of the followingdetailed description, taken in connection with the accompanying drawing,and wherein:

Figure 1 is a vertical sectional View through the blasting battery, theView being had on the line i-i of Figure 2.

Figure 2 is a View similar to Figure 1, taken on the line 2 2 of Figure1.

Figure 3 is a sectional detail view of an indicating means to reveal theposition of the sliding switch.

Figure 4 is a detail sectional View of the lower end of the plunger rodwith its switchiattached thereto.

Figure 5 is a detail View of an outside' switch assembly for completingcircuits from terminals.

Figure 6 is a diagrammatic view of the wiring arrangement employedbetween the battery and blasting point or points when a series of blastsare to be carried out.

Proceeding in accordance with the drawing, the invention embodies thecombination of a casing l of wood or other suitable material ofnonelectric conductivity to enclose the parts, which has an opening atthe top for the insertion of a reciprocatory metal plunger rod 2, withan op- (Cl. 17E-115) the rod the wiping or sliding movement of theswitch points makes connection through a battery `and a high tensionvibratory coil as the switch points 5 and 6 make contact with theposi,-` tive and negative sides of the electrical circuit. Theconnection of the switch points 5 and 6 with the electric circuit isbrought about through the medium of an insulating panel l of wood orother suitable material fastened tothe top and bottom of the casing asillustrated in Figure 1. Carried in equal spaced relation on the panel'l are metallic plates 8, separated by insulating members 9, and on eachplate is mounted a post l0 with knurled screw cap il. These posts l0have connection through their several wires l2 to similar posts i3 withknurled caps lli, the posts .i3 being mounted on the outside of thecasing and serve to provide terminals for lead wires to the point ofblast, such lead Wires being indicated at i6. Carried on the oppositemarginal edge of the panel 'l and in the path of the switch blade orpoint 5 is a metallic strip l'l, and by means of this strip and theplates 8 opposite, the plunger rod with its switch blades completes theelectric circuit.

The electric circuit is established by means of a small battery i8 and ahigh tension vibratory coil i9, the positive side of the battery beingconnected directly to one end of the primary winding of the coil throughthe wire 20, thence from the opposite end of the primary winding of thecoil through wire 30 to a post 3l fastened to metal strip l'l, andthrough switch e to plunger rod 2, thence to plunger guide 28, throughterminal 29 connected thereto-returning to battery on the wire 26.

The circuits from coil i9 through the shots or charges at blastingpoints 32, indicated diagrammatically in Figure 6, are establishedthrough wire 30 to metal strip ll, thence to switch i by means of theblades 5 and 6 to the plates t, through posts l0 and by wires l2 toposts i3, thence by wires i6 through the charges 32 and returning onwire 25, Figure 6, and also shown in Figure 2. The circuit continuesthrough post 22 and wire 2| to the coil i9, and is thus completed forthe iirst series of shots. For the second series of charges, switch 33,Figure 5, is closed, and return is by wire 30, Figure 6, to terminal2li, Flgures 2 and 5, thence through switch 33 to post 22 and wire 2i tocoil i9. For the third series of shots the return is made on wire 35 toterminal '23 and switch 36, when closed, to post 22 and wire 2l to coili9. The return terminal connections, however, as well as the lead wireterminals I6,

may be multiplied as far as is practical in the production andutilization o1' as large an apparatus or battery as is desired.

On the outside of the casing and secured to the plunger rod 2 is anindicator arm 3l which has associated therewith a scale carryingnumerals from 1 to 6 or such series of numbers corresponding with thenumber of contact points or plates 8 on the panel. This indicator is forthe purpose of ascertaining when a circuit is completed by the slidingswitch blades as the plunger is moved upwardly or downwardly.

In Figure 6 is shown diagrammatically an electrical circuit illustratingthe operation of utilizing the apparatus or battery in ring amultiplicity of charges or shots. In this circuit the lead wires I6 arefrom terminals I3 on the casing l and are of sufficient length so thatthe operator can be located at a safe distance from the place ofexploding charges. Other wires I6' are spliced or otherwise connected tothese lead wires I6, and when the sliding switch 4 on the plunger rod 2makes contact with the plates 8 and the metallicv strip I1, an explosionoccurs at the respective blasting points 32.

From the `foregoing it will also be apparent that the switch blades onthe plunger rod complete the electric battery circuit through the coili9 and also complete the connections of lead wires and return wires withthis coil, as the switch completes the circuits with the plates 8 andthe strip The operation of the plunger rod, through its switch, connectseach lead wire to one end of the primary winding of the coil (insuccession as the switch completes the circuits with the plates) and thereturn wire to the other end of the primary winding of this coil.

It is believed that with the foregoing description and explanationfurther details will not be necessary for the understanding of theapparatus. Likewise, and as before pointed out, the invention may bemodied by increasing the number of terminals, switch contacts, leads,and similar parts necessary to increase the capacity of the ringbattery, and similarly other alterations are capable, all of which maybe within the scope and meaning of the appended claims.

What is claimed as new is:

l. A multiple firing blasting device, comprising a casing, alongitudinal series of separate terminal contact elements supportedwithin the casing and insulated from each other, a corresponding seriesof separate circuit-wire-attaching elements mounted on the exterior wallportion'of the casing and insulated from each other, each of saidexteriorly mounted attaching elements being respectively connectedelectrically to a corresponding one of said series of interiorly mountedterminal contact elements, a reciprocatory plunger element slidablysupported within the casing in longitudinal and parallel relationcooperatively with said series of terminal contact elements, acomplementary, elongated contact elegether and' disconnecting said lastmentioned series of wire-attaching elements, at will, an electricalbattery and a high tension electrical element Within said casing, onepole of the battery being in electrical circuit connection with one endof the primary winding of said high tension element, said winding endbeing also in electrical circuit connection with one of said exteriorlymounted second mentioned series of wire-attaching elements, the oppositeend of said primary winding being in electrical circuit connection withsaid interiorly mounted elongated contact' element, and the oppositepole of the battery being in electrical circuit connection with saidreciprocatory plunger.

2. 'Ihe device as set forth in claim l, and further including anindicator comprising correlated. indicating points located and marked onthe exterior wall portion of the casing and a cooperative pointerelement mounted and operably connected to reciprocate in unison withsaid plunger element.

3. A self-contained, unitary, multiple ring blasting dveice, comprisinga portable casing, a cooperative electrical battery and a high tensionelectrical coil element within said casing, a sequential series ofseparate contact elements mounted within said casing, in spaced relationto and insulated from each other, an elongated contact element inparallel cooperative relation to said series of separate contactelements, spaced and insulated therefrom, a longitudinally disposed,reciprocatory element having an operating handle exteriorly of thecasing, said element extending and working in parallel relation to saidseries of separate contact elements and said elongated cooperativecontact element, switch contact elements on said reciprocatory element,in electrical circuit connection therewith and arranged and adapted totravel in continuous con.- tact with saidelongated contact element andintermittently and sequentially with said series of separate Contactelements, a series of circuitwire-attaching elements mounted exteriorlyon said casing, each of said attaching elements being respectively inelectrical connection with a corresponding one of said series ofseparate contact elements, a second series of circuit-wire-attachingelements mounted exteriorly on the casing, switch means for connectingtogether the attaching elements of said second mentioned series anddisconnecting them, at Will, one pole of the contained electricalbattery being in circuit connection with one end of the primary windingof the cooperative high tension coil element, and said end of thewinding being also in circuit connection with one of the wire-attachingelements of said second mentioned exterior series of said elements, theopposite end of the primary winding being in circuit connection withsaid elongated interior contact element,` and the opposite pole of thebattery being in circuit connection with said reciprocatory elementcarrying the switch contact elements.

4. The device as set forth in claim 3, and further comprising means onthe exterior Wall portion of the casing for indicating the relativeworking position of said reciprocatory element located contact elements.

HUGH W. BURNEY.

